Malicious PDF — malware analysis report

Static analysis result for SHA-256 5372ca3c25c5e04e…

MALICIOUS

PDF

79.2 KB Created: 2021-04-17 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 031c8dabaa3fd687c91634e659b0b899 SHA-1: 439bd35677a23f7a303e90a9fd81faab8327a870 SHA-256: 5372ca3c25c5e04e434e75d2ff21a85ad786cb3780053e8ec0993be4b08cb0a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'persuasive essay ideas', which is used to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=persuasive+essay+ideas+for+5th+graders PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff5ad2a08a5d.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/sogazoga1ejen.pdfIn PDF document text
    • http://foodguideblog.com/2791135711to650.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/412892.pdfIn PDF document text
    • https://rabifitirigi.weebly.com/uploads/1/3/0/7/130739094/derizuxifub_kamam_tasupun_zawid.pdfIn PDF document text
    • http://igme.site/27405955215fbsfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_6006387b0e80d.pdfIn PDF document text
    • https://rutosediwuxi.weebly.com/uploads/1/3/2/8/132814231/lawifevovifi-jabidax-dabozuronavevif-marapami.pdfIn PDF document text
    • http://nubolats.xyz/xuwulidupopaznzly.pdfIn PDF document text
    • http://ryukzak.digital/lejuzevividrw8gq.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/353840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_601ee14bc2afa.pdfIn PDF document text
    • http://istra-backwater.ru/talutefeavl7y.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/rosumibawozuvab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376372/normal_5fed4f24b797c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ffdfaf757e4a.pdfIn PDF document text
    • http://ontrade.top/lokuvalizexoxutuhybqo.pdfIn PDF document text
    • http://tumbaa.space/wh_phonics_worksheetsfu7p0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/752e3fd3-0b5f-45bf-ab6c-723207a15f73/ls4278_scanner_setup.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_9f03c320584f4abcbf3b51ba19ca54f7.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_210c03c889bf4ecfab6943bb20253641.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4c0d2d-8dca-4cc2-a364-5f581bf1fd08/my_not_so_perfect_life_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86ae0c4-7989-46f6-b792-2d918010797d/why_is_my_hotspot_not_working.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 5424 bytes
SHA-256: f746e05d18378b300e567322759bb5ea44e4a7fdfa0960739909acc7c99a77c9
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 10588 bytes
SHA-256: d260cfc5c8568d656f559beda4fbf845668a7d4597e6e0183b2c09d5d8c6df0a

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